[Xen-users] Copy-on-write Disk Images

To:	xen-users@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-users] Copy-on-write Disk Images
From:	Eric Harney <eharney@xxxxxxxxx>
Date:	Thu, 23 Aug 2007 09:56:34 -0400
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Hi all,
        
I am working on a project in which I would like to use copy-on-write VM
disk images in order to create "deltas" of a disk over a period of time.
        
For example, if I have a VM which uses /var/lib/xen/vm1/vm1.hda as its
disk image, can I attach a copy-on-write disk image which would record
changes in, /var/lib/xen/vm1/vm1-cow.hda rather than in the main disk
image file?
        
I've seen some of the projects listed on
http://wiki.xensource.com/xenwiki/COWHowTo but am not sure if something
like this is actually possible.
        
Has anyone ever configured copy-on-write images like this?  I'd be
interested in any notes/opinions people can provide about this kind of
configuration or any setup which provides similar results.
        
Thanks,
Eric



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[Xen-users] Copy-on-write Disk Images